Introducing water mist expertise – Part 2

Water mist know-how continues to be a relatively new idea when it comes to fireplace suppression, yet it is proving to be an thrilling improvement within the business. As the industry evolves, so do the rules, legal guidelines and requirements to have the ability to enhance security and allow improvement. These can vary largely from nation to country, and even area to area.
The means during which a water mist system operates is a similar mechanism to the standard sprinkler system in that the nozzles are often activated by way of a bulb which blows at a selected temperature allowing for the activation of the mist through a low-pressure water piping system.
Here we have a look at how some water mist nozzles are produced and put in – from arriving as a big ‘bar’ of steel, to becoming the environment friendly water mist nozzles we see installed in many new projects/developments across a lot of the globe today.
The metal arrives for cutting
Here at Dual Mist Ltd, Stainless Steel 304 is used for many parts as it is extremely durable and corrosion resistant compared to other related metals. The physique is machined out of Brass CZ121, which arrives as giant bars of steel which are delivered to the warehouse in 3m lengths. This is then minimize into two smaller elements able to insert into the machine. Not all water mist corporations have the flexibility to machine the components they require in-house although it could possibly show very helpful for price and production purposes as we are about to see.
Machining
The metal is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine tool is equipped with carbide tooling and high-pressure via coolant techniques, with the twin-spindle and twin-turret making haste of the otherwise sophisticated elements. A Citizen M532 Sliding Head Lathe is used for the smaller elements.
A Citizen L12 also makes the filters with a functionality of drilling 365 holes in fifty one seconds, completely automated – this implies it could possibly turnover an unimaginable 4,000 filters in a weekend fully unmanned.
The brass heads are also de-burred on the machine, removing all sharp edges earlier than being polished and despatched for Electroless Nickel Plating. This provides a corrosion-proof coating to the brass, enabling it to turn into much more durable. All elements are then inspected for dimensional accuracy before the meeting stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing phases.
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There are many small elements of assorted styles and sizes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a total of 13 parts or ‘components’. These elements are then meticulously put collectively and assembled by the production team requiring a fair amount of labour before the ultimate product is achieved. Various phases embody tightening with specially tailored instruments, pressing using a hand-press and using a particular ‘Locktite’ method at some levels which is a threadlock that prevents fixings from coming unfastened in the course of the operational lifetime of the product. The last stage of assembly is fastidiously loading the bulb and applying the right load to it utilizing a torque wrench.
The assembled nozzles are then positioned on another machine in order to be labelled and uniquely recognized utilizing a serial number. At Dual Mist Ltd that is accomplished on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they are able to be placed via the various stages of testing.
Testing
Cull Testing
Also known as bubble testing in layman’s phrases, this test is to ensure no damage has occurred to the bulb throughout assembly and is a important test for LPCB approval. The check involves using a high-powered microscope to measure the size of the bubble in each bulb before placing in warm water to have the ability to shrink the dimensions of the bubble to nothing. Once that is checked, the nozzles are then left to relaxation and return to room temperature earlier than the bubble is measured as soon as once more so as to ensure it has returned to the unique dimension inside a small tolerance.
Leak Testing
Every nozzle can be stringently tested for leaks by applying 24-bar stress for 1 hour and making certain no water has escaped. It is rare for any leaks on the manufacturing line, but that is a particularly very important stage of the testing as leaks could occur if filth is trapped within the seal face.
Activation Testing
On a month-to-month basis, random nozzles are additionally examined for activation by inserting the nozzle on a stress jig at various pressures and making use of warmth to the bulbs. The nozzles should all activate cleanly throughout the entire pressure vary specified to that nozzle.
A member of the manufacturing staff makes use of a microscope and software to discover out the scale of every bubble within the bulb.
Approvals
At Dual Mist Ltd, these exams are not simply to assure the quality of the production line but are also an necessary part of the LPCB Approval. These approvals allow prospects to recognise that the products they’re shopping for are made to the highest potential high quality normal in the area.
The disadvantage to that is that the Approval Testing system could be each costly and time-consuming – sometimes needing to be booked a quantity of months upfront and requiring years of onerous work to attain.
The nozzles produced by Dual Mist have been put by way of their paces at BRE Global by method of each fireplace testing and component/type approval.
Tamper proofing
In order to ensure that no one is tempted to intrude with the grub screw holding the bulb, a small plastic bung is pressed into the grub screw. The stress load setting on the bulb is then subsequently fixed.
The nozzles are then able to be packaged and despatched off for set up.
Here is an example of a management panel having been installed in The Claridges Hotel, London, UK. This is where the system is operated.
Installation
Rather than having to make use of the heavy and labour-intensive steel pipes usually used in high-pressure methods, low-pressure water techniques can use CPVC piping. This is a special kind of fire-resistant plastic enabling fast installation. Instead of threading each pipe, a heated glue can be used to shortly construct giant pipe networks. These networks are approved to deal with as a lot as 12 bar strain. The nozzles are screwed right into a particular pipe adaptor using a half-inch gas becoming.
An electrical management panel is fitted for the system control along with pumps and a water tank, normally with a mains feed.
The system is tested, signed off and handed over to the shopper.
The ultimate product once put in. This shows how we anticipate to see the nozzles as soon as a venture has been accomplished.
Conclusion
As we will see there are numerous phases to go from steel to nozzle head with each nozzle taking a major effort by varied professionals to finish to the approved standard.
Not only do water mist nozzles require a quantity of phases of machining and assembling, they want to also bear a string of checks to be able to be approved for set up. Once put in, there are even additional checks undergone, typically by third-party organisations to guarantee that the whole fire suppression system to lastly be handed over to the consumer.
Water mist expertise assures safety, quality and assurance by way of the stringent testing that’s required.
With the current publication of water mist requirements, particularly in Britain over current years, building builders can now be assured that the quality required for water mist systems is now at an equivalent standard to different suppression methods.
For more information, go to www.dualmist.com
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